I had read one article where it said something like “...13 phone calls in the days and weeks before...”. Still odd, but makes more sense than 13 calls in one day.
13 calls over a few weeks would not be noteworthy for the police BUT 13 calls on that day would be noteworthy particularly if packed together just before the phones were turned off.
The 13 calls were that day. She made over 700 to him on her phone since the first of the year. That’s 100 a month. 25 a week. 3 a day. What 16 year old calls a 40 year old that often if he truly makes them uncomfortable?